title: Selective adsorption of Pb(II), Cd(II), and Ni(II) ions from aqueous solution using chitosan-MAA nanoparticles.
abstract: Chitosan-MAA nanoparticles (CS-MAA) with an average size of 10-70 nm were prepared by polymerizing chitosan with methacrylic acid in aqueous solution. The physicochemical properties of nanoparticles were investigated using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), dynamic light scattering (DLS) and nuclear magnetic resonance (NMR). The adsorption of Pb(II), Cd(II) and Ni(II) from aqueous solution on CS-MAA was studied in a batch system. The effects of the solution pH, initial metal concentration, contact time, and dosage of the adsorbent on the adsorption process were examined. The experimental data were analyzed using the pseudo-second-order kinetic equations and the Langmuir, Freundlich and Redlish-Peterson isotherms. The maximum adsorption capacity was 11.30, 1.84, and 0.87 mg/g for Pb(II), Cd(II) and Ni(II) ions, respectively, obtained by the Langmuir isotherm. However, the adsorption isotherm was better explained by the Freundlich rather than by the Langmuir model, as the high correlation coefficients (R(2)>0.99) were obtained at a higher confidence level.
authors.affiliation: Department of Environmental Science, Faculty of Natural Resources, Tarbiat Modares University, Imam Reza Street, Noor, Mazandaran Province, PO Box: 46414-356, Iran.
authors.forename: Aghdas
authors.initials: A
authors.lastname: Heidari
authors.forename: Habibollah
authors.initials: H
authors.lastname: Younesi
authors.forename: Zahra
authors.initials: Z
authors.lastname: Mehraban
authors.forename: Harri
authors.initials: H
authors.lastname: Heikkinen
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000737:chemistry; D048271:Chitosan / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions / Q000737:chemistry*; D007700:Kinetics; D007854:Lead / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D009532:Nickel / Q000737:chemistry; D019906:Nuclear Magnetic Resonance, Biomolecular; D010316:Particle Size; D011109:Polymethacrylic Acids / Q000737:chemistry*; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D007477:Ions; D008670:Metals; D011109:Polymethacrylic Acids; D012996:Solutions; D002104:Cadmium; D007854:Lead; D009532:Nickel; D048271:Chitosan
keywords: Adsorption isotherm; Chitosan–MAA nanoparticle; Desorption; Kinetics